wget https://studygolang.com/dl/golang/go1.15.5.linux-amd64.tar.gz -P /tmp
sudo tar -C /usr/local -xzf /tmp/go1.15.5.linux-amd64.tar.gz
rm -rf /tmp/go1.15.5.linux-amd64.tar.gz
sudo ln -s /usr/local/go/bin/go /usr/local/bin/go
export GOPROXY=https://goproxy.cn

